Server-side and ISP Filters

All major spam filters

Each test includes spam filters from ISPs and webmail providers, as well as corporate filters.

Server-side filters

Barracuda

MessageLabs

Postini

SpamAssassin

ISP Filters

AOL Mail

Gmail

GMX

Mail.com

Outlook

Yahoo! Mail

Human-Readable Feedback

Improve your scores with actionable advice

Not only do we show you your spam score, we also explain why you got that score. We provide plain-language explanations for more than 1,000 filter codes. This advice helps you adapt your email's content to improve delivery rates.

Litmus is hiring

With over 400 attendees and 20 sessions covering everything from mobile email to content strategy to design testing, The Email Design Conference 2014 was unforgettable. Weren’t able to attend? The session videos from this year’s sold out conference have you covered—get the videos today!